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Finding the Fourth Proportional to 1,012.20, 1,397.25 and 663

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Solution

The fourth proportional to 1,012.20, 1,397.25 and 663 is: 915.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.20 : 1,397.25 = 663 : x
  2. Step 2: Convert to fraction form
    1,012.20/1,397.25 = 663/x
  3. Step 3: Cross multiply
    1,012.20x = 1,397.25 × 663
  4. Step 4: Simplify right side
    1,012.20x = 926,376.75
  5. Step 5: Solve for x
    x = 926,376.75/1,012.20
  6. Step 6: Final answer
    x = 915.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.